![]() In addition the study found maternal variance ( P < 0.05) for BD, BWH, body thickness and fillet weight explaining ~10% of the observed phenotypic variance. 0.09), respectively in the current breeding population. Substantial contributions of dominance were observed ( P < 0.05) for body depth (BD) and body weight at harvest (BWH) with estimates of d 2 = 0.27 (s.e. ![]() The study included observations on 2524 offspring from 155 full-sib families. ![]() Here, a factorial design with reciprocal cross, common rearing of eggs and subsequent lifecycle stages and pedigree assignment using DNA microsatellites was used to separate these effects and estimate dominance (d 2) and maternal (m 2) ratios in Nile tilapia for six commercial traits. There are only few studies of dominance effects in non-inbred aquaculture species, since commonly used mating designs often have low power to separate dominance, maternal and common environmental effects.
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